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| Yield effect of subsurface drip irrigation and nitrogen supplement in different precipitation years |
| FENG Haoyuan1,2, YIN Guanghua1*, MA Ningning1, GU Jian1,3, CAO Xiujia1,2, LIU Yongqi4 |
| 1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China; 4. College of Water Conservancy, Shenyang Agricultural University, Shenyang, Liaoning 110866, China |
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Abstract Field experiment was conducted to study the maize yield effect of a long-term subsurface drip irrigation with nitrogen fertilizer supplement in different precipitation years under the condition of nature precipitation. Experiment is designed as a completely random stuff and results indicate that the total yield of wet year is greater than that in drought year. The yields between treatment W3N3 and W3N1 show no significant difference in different precipitation years. Irrigation affects maize yield significantly(P<0.05)in drought year and highly significantly(P<0.01)in wet year. Significant diffe-rence is not found among nitrogen supplement treatment in drought year but is noticed in wet year(P<0.01). There is a significant effect(P<0.05)in the interaction of irrigation and nitrogen supplement in drought year but no significant effect in wet year. Yield increases at first and then decreases with the promotion of nitrogen supplement in both kinds of precipitation years but the increment and decrement of yield in wet year is greater than that in drought year. An appropriate mode of irrigation and fertilization in different precipitation years is established: compound fertilizer(N∶P2O5∶K2O=15∶15∶15)is furrow applied in the amount of 450 kg/hm2 as base fertilizer in sowing period; total water supply amount is 48 mm and total nitrogen supplement amount is 120 kg/hm2 in drought year; total water supply amount is 36 mm and total nitrogen supplement amount is 240 kg/hm2 in wet year.
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Received: 28 February 2020
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